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1. Each cell is either land or water. Only click on the water.
2. Each numbered cell is on a separate island, and the number indicates how many contiguous cells make up that island (i.e., how big is the island). An island may NOT exist without a number.
3. Contiguous means horizontally or vertically adjacent, not diagonal. Separate islands can be adjacent diagonally.
4. All water cells form one CONTIGUOUS stream of water. No 2x2 blocks of water are allowed, as it is a stream.